Abductor Pollicis Brevis (APB)

Authors

Affiliations

Nate Yomogida, B.S., SPT

Doctor of Physical Therapy

B.S. in Kinesiology

Chloë Kerstein, B.S., SPT

Doctor of Physical Therapy

B.A. in Neuroscience

Figure 1: Intrinsic Muscles of the Hand¹

Palmar muscles of the hand (left)²

Table 1

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Origin

• Flexor retinaculum³
• Scaphoid³
• Trapezium³

Insertion

Lateral side of base of 1st proximal phalanx (via radial seasamoid)³

Innervation

Recurrent Br. of Median N. (C8, T1)³ # Action {#action}

1st CMC: Abduction³

Notes

1.

Betts JG, Blaker W. Anatomy and Physiology. 2nd ed. OpenStax; 2022. https://openstax.org/details/books/anatomy-and-physiology-2e/?Book%20details

2.

Gray H. Anatomy of the Human Body. 20th ed. (Lewis WH, ed.). Lea & Febiger; 1918. https://www.bartleby.com/107/

3.

Gilroy AM, MacPherson BR, Wikenheiser JC, Voll MM, Wesker K, Schünke M, eds. Atlas of Anatomy. 4th ed. Thieme; 2020.